The optimal number of sit and gos per session

After four years of sit and go no limit hold'em experience, I can tell you the optimal number of sit and gos to play per session. Actually, that statement is misleading. The only thing I can tell you with confidence is the number which turns out to be optimal for me. That happens to be four. If I haven't made a profit in four sit and gos, it's highly unlikely that I'm going to make a  profit by playing additional sit and gos in that session. When you've been in the sweetness for a long time, however, it's especially hard to convince yourself that it's time to quit. I couldn't do that last night, and lost an additional $100,000 as a consequence.

style flavor buy_in entry players hands place winnings

SNG   NLHE    44000  6000       6    23     5        0
SNG   NLHE    44000  6000       6    47     2    92400
SNG   NLHE    44000  6000       6    74     2    92400
SNG   NLHE    44000  6000       6    20     4        0
SNG   NLHE    44000  6000       6    31     3        0
SNG   NLHE    44000  6000       6    28     5        0

delta: $-115,200
Sit and go no limit hold'em balance: $3,100,840
balance: $10,653,929